The room was originally a classroom and then a glassblowing studio filled with ovens and tools. I don't know if vaulted part was put in after it was a classroom or not. Carpet and soft things and the like would help but we put in wood floor with the intention of it being a math workshop space where things could get messy. One wall is entirely windows and a double glass door which doesn't help either, and we replaced textured wall paper with drywall which made it worse. Curtains and a quilt on the wall and a couple of sofas didn't help enough either. We played with hanging acoustic tile around the top of the walls but none of us liked the look.

So we bit the bullet and began hanging the tiles on the ceiling. After just tiling that little area in the picture there is a marked difference in sound quality, and the tiles look surprisingly good. The angle on the picture doesn't show it well, but I think it will look great when done and all sound problems will be solved. Artwork will hang up there when we're done.